The ground-breaking report from Oxford clearly shows that a meat-free diet is found to have a much lower environmental impact on land use, water pollution, water use, and biodiversity loss. It also found that high-meat diets produce four times more greenhouse gases than vegan diets. All things considered, we would all be better off for the planet if we reduced our meat consumption.
It's oversimplifying things to say that vegetarianism is better for the environment than eating meat because so much of our vegetables are imported. It's not the government's role to impose authoritarian policies on what people can farm or tell consumers what to eat. People already have vegetarian options but are not opting for them. Instead, the government should push for meat production to be made more efficient and to have the scientific community breed genetically engineered cows that emit less methane.